Projection apparatus



4a citizen of the Patented July 14, 1925.

UNITED STATES .PATEN GEORGE A. maur, OP PHILADELPHIA, PENNSYLVANIA.

PROJECTION APPARATUS.

Application led July 9,

To all whom t may-concern:

Be it known that I, GEORGE A. MACKAY, United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Projection Apparatus, of which the following is a specification.

This invention relates to apparatus for the projection of pictures, drawings and the like onto an illuminated screen during the process of their production, and it has more particular reference to apparatus intended for the Ocular entertainment of an audience, while at the same time being instructive and pleasing to onlookers.

Among theobject of this invention is to provide a projection apparatus of the type referred to by which pictures, drawings, images, caricatures and announcements may be produced and projected onto a darkened or opaque screen in a novel manner, and by a novel means whereby all shadow lines are eliminated and the hand of the operator as well as'the drawing instrument employed in producing the picture are entirely obscured. In other words, only the picture or other matter sketched or drawn is viewed during its production on the screen, while the color and shade of said picture or other matter may be varied at the operators discretion.

` parent and noted Another object of my invention is to rovide a projection apparatus characterlzed by a wide range of adjustment and having means for conveniently supporting the operators hand in a. restful manner, whereby freedom of wrist movement can be resorted to without inconvenience.

Other objects and advantages will be apas this description proceeds, while the scope of my invention will be found succinctly defined by the appended claims.

Referring to the drawin s lustration of one practiczll this invention;

Fig. 1 is a sectional perspective view of my novel projection apparatus.

Fig. 2 is a detailplan ofi:J pigment coated disk hereinafter fully described; and,

Fig. Sis a transverse section through the same. A A.

In carrying out my-invention, I-construct :inappropriately configured box or casing 4 of reproof and lightproof material-a which are in ilembodiment of `convenient source by means' 'having at its upper end an 192s. serial No. 650,319.

thou h wood may be emplOyed,-and suicient y light in wei ht to permit of its ready transportation. T is box or casing 4 is adapted to house and support on its bottom 5 a closed-in lamp 6 conveniently embodying a removable four-hundred-watt incandescent light 7. Said light 7 is adapted to be supplied with electric current from any of a wire 8 under control of a switch 9 iin the well known way. Supported on a bracket 10 at the rear of the light socket is a removable reiector 11, that isl adapted to concentrate the light rays emitted by the light 7 to a spot-hght lens 12 mounted in the front of the lamp 6. v

The aforesaid box or casing 4 in so far as that part housing the lamp 6 is concerned may be o en topped, or it may have a covering 13 o l heatA insulating material while the frontal portion is` iiitted with a fixed top or platform 14 having fitted therein a removable y/spot-light lens 15 with its concaved surface downwards, and its Hat face iush with the plane or top surface of said latform 14. Transversely of the frontali) portion of the box or casing 4 and fitting light walls thereo 16, the plane of the light rays passing the lens 12 vertically through the spot light lens 15, as clearly in.- gicated by the arrowed line appearing o'n emovably mounted by thumb 4screws 17 on the top or platform 14 is a tubular stand-- ard 18 fitted with a telescopic section 19.`

adjustable bracka projecting mirtproof into the opposed vertical I arrange an inclined mirror et 20, in turn Iitted with which is such as to direct ror 21 angularly adjustable by means of a This mirror 21 serves to roduced above the spot ight lens 15 onto a distant screen 23, as later on more fully explained. jVertically adjustable on the tubular standard 18 is a horizontally dis osed bracket 24 having an aperture therein tted with 4an appropriate projectin -lens tube 25 which is arranged vertica ly and co-axially above the spot light lens 15.

Convenientl hinged at 26 to the frontal edge of the a oresa1d top or platform 14 is a hand rest or flap 27, adapted for angular adjustment relative thereto by an appropriate adjustable linkage-28, or altalidrant and thumb screw 22.

.roject the picture los This hand rest or ,flap 27, as will be obvious, serves to support the operators wrist as indicated by the dotted outline 29, and it will be clear the same provides for variable inclination to accommodate different requirements as well as' angular manipulation of a sketching or drawing instrument.

In'conjunction with the apparatus abo-ve described, I employ a flat plate or disk' 30, preferably of ruby glass, adapted to be coated on its upper face with alight occluding pigment 31 ofa plastic or semiplastic nature, said pigment coated surface serving in use to have the picture, sketch, drawing, caricature, announcement produced therein with a pencil 32, or other suitable instrumentality. This flat plateor disk 30 is adapted to be seated with `its uncoated Surface in abutment over the spot light lens 14, and it isconveniently held so positioned by clamping angles 33, or the like.

AIn -u'slng the apparatus, the artist or operator draws, sketches or otherwise produces a picture, sketch, announcement, caricature or the like by maniplulating the drawing instrument 32 on t e' pigment coated face 31 of the plate 30, whereupon the concentrated lightpassing the lens l5 will produce the picture in ruby color on the distant screen 23, an image 3 being indicated by way of example only, whereupon the audience will see lsaid 'picture as it is being produced line by line. As .a result of using an appropriate light occluding pigment, it is to be particularly noted that the picture or image 34 produced will be entirely free from any shadow lines whatsoever, which ,are so objectionable from an oc'- ular viewpoint with apparatus hitherto employed for analogous and like purposes.

From the foregoing it will beapparent that by making the various parts adjustable, and removable, the entire apparatus may be compactly stored in the box or casing 4 and closed in by an appropriate end cover indicated at 35; or, the hand rest 27 may be of sufficient dimensions to serve a like purpose. The apparatus is extremely useful in the entertainment of an audience, and it may have associated attachments or refinements that` will tend to increase its scople and utility but I desire to specially emp lasize the use of the pigment coate'd plate 30 of opaque or colored glass for the purposes set forth.

Various detail changes may be effected Without departing from the spirit and scope of my above described and illustrated invention, as more specifically defined by the applended claims, for example I may furms a collapsible tripod stand for supporting the boX or casing 4, and thereby greatly add to its ease and facility of use' in cramped places. i

i Having described my invention, what I claim as new and desire to secure by `Letters Patent, is

l. A projecting apparatus comprising a casing enclosing a .high powered lamp fitted with a concentrating reflector, a lens inspaced relation to said lamp, an inclined mirror and spot-light lens for deiecting the light from the lamp, an adjustable projecting lens removably supported above the spot light lens, an ad'ustable projecting mirror associated with t e projecting lens, a pigment-coated ruby glass lateadapted for clamping abutment on t e outer face of the spot light lens, and an adjustable wrist support fory the artist Vwhile sketching or (lutherwise operating on said pigment-coated ens.

2. A projecting ap aratus comprising a casing enclosing -a hig powered lamp fitted With a concentrating reflector, a lens in spaced relation to said lamp, an inclined `mirror and spot-light lens for deflecting the light from the lamp, an adjustable project` ing lens removably supported above the spot light lens, anvadjustable projecting mirror associated with the projecting lens, a pigment-coated ruby glass plate adapted lfor clamping -abutment on the outer surface of the spot light lens, an adjustable wrist support forr the artist while sketching or otherwise operating on said pigment-coated lens, and means for supporting the aforesaid projecting apparatus.

In testimony whereof I aix my signature this 6th day of July, 1923.

GEORGE A. MCKAY. 

